29-03-2018, 07:13
Thank you, Werk_AG, for the suggestion about using tools in the utilities folder to check functioning of the RX board itself, I hadn't thought of that! 
I'll try that a little later and post the results here.
I also hadn't thought of replacing the diode on the mega 2560 and trying to reprogram it off the board which I may do, although an alternative I *had* thought of is to power it from an external supply and then try reprogramming? Unfortunately I don't have a programmer right now, although I've just looked up the USBasp and as they are very cheap I may get one if everything else fails.
Thank you again for your suggestions and I will report back later!
Allan
I'll try that a little later and post the results here.I also hadn't thought of replacing the diode on the mega 2560 and trying to reprogram it off the board which I may do, although an alternative I *had* thought of is to power it from an external supply and then try reprogramming? Unfortunately I don't have a programmer right now, although I've just looked up the USBasp and as they are very cheap I may get one if everything else fails.
Thank you again for your suggestions and I will report back later!
Allan